Wednesday, December 18, 2013

Bond strength of overdenture locator posts cemented with seven luting agents.

J Contemp Dent Pract. 2013 Jul 1;14(4):675-80.


Statement of the problem: Post retention is crucial factor in restoration survival. Posts are commonly failed due to loss of retention. It is unknown which luting agents would provide the maximum bond strength for Locator overdenture posts. Aim: The aim of this study was to evaluate the bond retentive strengths of Locator overdenture posts cemented with 7 luting agents. Materials and methods: One hundred and five single rooted human teeth were decoronated and randomly assigned to 7 groups (n = 15). Post spaces were prepared with Locator post drills to the depth of 6 mm. The Locator posts were cemented with Variolink II, RelyX ARC, Multilink N, RelyX Unicem, ParaCore, or MultiCore Flow resin luting agents. Zinc phosphate cement was served as control group. Specimens were stored in water at 37°C for 24 hours. Each specimen was loaded in tension in an Instron universal testing machine. The maximum force required to dislodge each Locator post was recorded. Means and standard deviations were calculated and data were statistically analyzed with one-way analysis of variance (ANOVA). Results: The highest mean bond strength value for Locator posts was recorded for MultiCore(®) Flow group (mean = 550.1 N), while the lowest mean value was for RelyX Unicem(™) resin cement group (mean = 216.8 N). A statistically significant difference in mean locator overdenture post bond strength was observed between the 7 cement types (p < 0.0001). ParaCore(™) and MultiCore(®) Flow groups had significantly higher bond strength than all other groups, but they were not differed from each other. Conclusion: Bond strength of Locator overdenture posts were influenced by the type of luting agents. MultiCore Flow and ParaCore resin cements offered the greatest retention. Clinical significance: The type of luting agents had a significant effect on the retention of Locator posts. The use of Core buildup resin cements as luting agent with Locator post demonstrated the greatest retention.

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